Xcode 11.4 Beta 3 was released on 3 Mar 2020 and requires macOS 10.15.2+.
It can be downloaded from https://download.developer.apple.com/Developer_Tools/Xcode_11.4_beta_3/Xcode_11.4_beta_3.xip.
Release notes are located at https://developer.apple.com/documentation/xcode_release_notes/xcode_11_4_beta_3_release_notes.
The SDKs it contains are:
- iOS 13.4 (Build 17E5249a)
- macOS 10.15.4 (Build 19E250a)
- tvOS 13.4 (Build 17L5251a)
- watchOS 6.2 (Build 17T5250a)
The compilers it contains are:
- clang 11.0.3 (Build 1103.0.32.26)
- swift 5.2 (Build 1103.0.30)